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S TYPE R fuel pump shuts down

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  #21  
Old 02-16-2012, 04:00 PM
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Originally Posted by xjrguy
Time to take a breather...... Lots of input here, some of it misleading.

For 2005:

XK8/XKR -- one fuel pump only.
X-Type, S-Type Normally Aspirated and XJ NA -- Fuel Pump RH, Jet Pump LH
[Jet pump sends fuel from LH to RH side to be available to Electric pump]
S-Type Supercharged and XJ Supercharged -- 2 Fuel Pumps, RH & LH
[Pumps are in parallel and run together, all the time]

I think it would help some to seek out the Fuel Trim FAQ and read the two papers. In this case, with the car running so bad under load, the fuel trims are only responding to the misfires. Misfires flood the exhaust with oxygen that didn't get burned and the trims go haywire. Consequently, they seem to indicate air leaks.

The misfire cause should probably be the central issue. Just based on the original description I tend to come down on the plugged catalyst possibility. You have to consider the 'self preservation' functions designed into these systems, and consider the ECM may be shutting down the pump or pumps to prevent a catalyst meltdown.

That may not be the case, but by the same token, catalyst substitution may be the only conclusive diagnostic strategy, one way or the other.

My two cents.......
saw a plugged cat instance on another thread str not running right but i had to remove most of my post because as was mentioned it got confusing real fast so i started fresh. xjrguy what is you input on swapping coils side to side to see if it follows indicating coil breakdown
 
Last edited by Bobco51; 02-16-2012 at 04:05 PM.
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  #22  
Old 02-16-2012, 04:02 PM
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Yes. It's likely the PCM protecting the car from what it sees as likely damage as best it can.
 
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  #23  
Old 02-16-2012, 04:10 PM
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Originally Posted by BOBCO51
saw a plugged cat instance on another thread str not running right but i had to remove most of my post because as was mentioned it got confusing real fast so i started fresh. xjrguy what is you input on swapping coils side to side to see if it follows indicating coil breakdown
I'm down with that.......easy to do, and might see MAJOR misfires go from even to odd cylinders.

Logical step, go for it!
 
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  #24  
Old 02-16-2012, 04:42 PM
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I WILL POST MY FINDINGS but for now its almost time for a cold one
 
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Old 02-16-2012, 05:30 PM
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Hard to believe so many coils all on the same bank have gone bad at once.
 
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  #26  
Old 02-16-2012, 05:44 PM
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I think Steve is on the right track. All the coil failures on one side was an oversight by me. I am anxious to see what the cause is.
 
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Old 02-16-2012, 06:50 PM
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I have to agree with JagV8. ALL the coils on one side went bad all at once?? Not common but it could happen.
.
.
.
 
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  #28  
Old 02-16-2012, 06:54 PM
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Originally Posted by JagV8
Hard to believe so many coils all on the same bank have gone bad at once.
Yes hard to believe all coils on one side are breaking down at the same time, i am yet to see more than three at a time and there is an obvious misfire.
 
Last edited by Bobco51; 02-16-2012 at 07:03 PM.
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  #29  
Old 02-16-2012, 07:07 PM
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Failures of all coils on one side is not the norm but failure of an item that is related or controls those coils is possible. This situation is out of the norm so please post what you find.
 
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  #30  
Old 02-16-2012, 09:52 PM
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I wasn't actually suggesting total coil failure on one side was the cause here, my point was that at this juncture since it would be so easy to do, he might as well give it a go. Maybe we'll be surprised and the misfires will move, but I doubt it. After everything he has reported, I'm still hangin' my hat on a catalyst issue.

And I'm sorry about this Gus, but I have to ask this question:

Bobco, does this car currently have platinum, surface gap or split-fire spark plugs in it?? It should have iridium plugs.

Cheers,
 
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  #31  
Old 02-16-2012, 10:17 PM
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Steve,

I have no problem with your question and I know where you are going and why. Your OK!
 
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  #32  
Old 02-17-2012, 03:00 PM
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Problem resolved, I did not swap coils i went for the fastest way to test the cat, I simply removed the front 02 on suspected bank and now rev over 5K easy
Thanks for all the input
Bob
 
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  #33  
Old 02-17-2012, 03:14 PM
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Kudos to you!

Can someone tell me why it seems that the S-Type cats seem to fail more often that other cars or is that just my impression?
 
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  #34  
Old 02-17-2012, 03:32 PM
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Misfires / air leaks which are either not noticed or ignored would be my vote. Time and again we get people who've ignored the "idiot" light, may even have frequently cleared codes, and finally have to do something if they need a state inspection or the car stalls etc.
 
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  #35  
Old 02-17-2012, 04:33 PM
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I just love it when a plan comes together........

Way to go Bobco, jump right on in there. That's how you fix things!

Cheers,
 
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